i2c-au1550: Convert to platform driver
Convert the i2c-au1550 bus driver to platform driver, and register a platform device for the Alchemy Db/Pb series of boards. Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net> Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Manuel Lauss
Jean Delvare
parent
91f27958d6
commit
8b798c4d16
3 changed files with 124 additions and 97 deletions
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@ -270,6 +270,24 @@ static struct platform_device smc91x_device = {
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#endif
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/* All Alchemy demoboards with I2C have this #define in their headers */
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#ifdef SMBUS_PSC_BASE
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static struct resource pbdb_smbus_resources[] = {
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{
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.start = SMBUS_PSC_BASE,
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.end = SMBUS_PSC_BASE + 0x24 - 1,
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.flags = IORESOURCE_MEM,
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},
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};
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static struct platform_device pbdb_smbus_device = {
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.name = "au1xpsc_smbus",
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.id = 0, /* bus number */
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.num_resources = ARRAY_SIZE(pbdb_smbus_resources),
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.resource = pbdb_smbus_resources,
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};
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#endif
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static struct platform_device *au1xxx_platform_devices[] __initdata = {
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&au1xxx_usb_ohci_device,
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&au1x00_pcmcia_device,
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@ -287,6 +305,9 @@ static struct platform_device *au1xxx_platform_devices[] __initdata = {
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#ifdef CONFIG_MIPS_DB1200
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&smc91x_device,
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#endif
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#ifdef SMBUS_PSC_BASE
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&pbdb_smbus_device,
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#endif
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};
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int __init au1xxx_platform_init(void)
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@ -30,14 +30,22 @@
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <asm/mach-au1x00/au1xxx.h>
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#include <asm/mach-au1x00/au1xxx_psc.h>
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#include "i2c-au1550.h"
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struct i2c_au1550_data {
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u32 psc_base;
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int xfer_timeout;
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int ack_timeout;
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struct i2c_adapter adap;
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struct resource *ioarea;
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};
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static int
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wait_xfer_done(struct i2c_au1550_data *adap)
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@ -299,18 +307,48 @@ static const struct i2c_algorithm au1550_algo = {
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* Prior to calling us, the 50MHz clock frequency and routing
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* must have been set up for the PSC indicated by the adapter.
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*/
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int
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i2c_au1550_add_bus(struct i2c_adapter *i2c_adap)
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static int __devinit
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i2c_au1550_probe(struct platform_device *pdev)
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{
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struct i2c_au1550_data *adap = i2c_adap->algo_data;
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volatile psc_smb_t *sp;
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u32 stat;
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struct i2c_au1550_data *priv;
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volatile psc_smb_t *sp;
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struct resource *r;
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u32 stat;
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int ret;
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i2c_adap->algo = &au1550_algo;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r) {
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ret = -ENODEV;
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goto out;
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}
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priv = kzalloc(sizeof(struct i2c_au1550_data), GFP_KERNEL);
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if (!priv) {
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ret = -ENOMEM;
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goto out;
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}
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priv->ioarea = request_mem_region(r->start, r->end - r->start + 1,
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pdev->name);
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if (!priv->ioarea) {
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ret = -EBUSY;
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goto out_mem;
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}
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priv->psc_base = r->start;
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priv->xfer_timeout = 200;
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priv->ack_timeout = 200;
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priv->adap.id = I2C_HW_AU1550_PSC;
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priv->adap.nr = pdev->id;
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priv->adap.algo = &au1550_algo;
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priv->adap.algo_data = priv;
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priv->adap.dev.parent = &pdev->dev;
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strlcpy(priv->adap.name, "Au1xxx PSC I2C", sizeof(priv->adap.name));
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/* Now, set up the PSC for SMBus PIO mode.
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*/
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sp = (volatile psc_smb_t *)(adap->psc_base);
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sp = (volatile psc_smb_t *)priv->psc_base;
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sp->psc_ctrl = PSC_CTRL_DISABLE;
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au_sync();
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sp->psc_sel = PSC_SEL_PS_SMBUSMODE;
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@ -348,87 +386,87 @@ i2c_au1550_add_bus(struct i2c_adapter *i2c_adap)
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au_sync();
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} while ((stat & PSC_SMBSTAT_DR) == 0);
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return i2c_add_adapter(i2c_adap);
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ret = i2c_add_numbered_adapter(&priv->adap);
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if (ret == 0) {
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platform_set_drvdata(pdev, priv);
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return 0;
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}
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/* disable the PSC */
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sp->psc_smbcfg = 0;
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sp->psc_ctrl = PSC_CTRL_DISABLE;
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au_sync();
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release_resource(priv->ioarea);
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kfree(priv->ioarea);
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out_mem:
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kfree(priv);
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out:
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return ret;
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}
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int
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i2c_au1550_del_bus(struct i2c_adapter *adap)
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static int __devexit
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i2c_au1550_remove(struct platform_device *pdev)
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{
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return i2c_del_adapter(adap);
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}
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struct i2c_au1550_data *priv = platform_get_drvdata(pdev);
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volatile psc_smb_t *sp = (volatile psc_smb_t *)priv->psc_base;
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static int
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pb1550_reg(struct i2c_client *client)
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{
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platform_set_drvdata(pdev, NULL);
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i2c_del_adapter(&priv->adap);
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sp->psc_smbcfg = 0;
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sp->psc_ctrl = PSC_CTRL_DISABLE;
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au_sync();
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release_resource(priv->ioarea);
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kfree(priv->ioarea);
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kfree(priv);
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return 0;
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}
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static int
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pb1550_unreg(struct i2c_client *client)
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i2c_au1550_suspend(struct platform_device *pdev, pm_message_t state)
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{
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struct i2c_au1550_data *priv = platform_get_drvdata(pdev);
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volatile psc_smb_t *sp = (volatile psc_smb_t *)priv->psc_base;
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sp->psc_ctrl = PSC_CTRL_SUSPEND;
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au_sync();
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return 0;
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}
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static struct i2c_au1550_data pb1550_i2c_info = {
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SMBUS_PSC_BASE, 200, 200
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};
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static struct i2c_adapter pb1550_board_adapter = {
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name: "pb1550 adapter",
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id: I2C_HW_AU1550_PSC,
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algo: NULL,
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algo_data: &pb1550_i2c_info,
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client_register: pb1550_reg,
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client_unregister: pb1550_unreg,
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};
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/* BIG hack to support the control interface on the Wolfson WM8731
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* audio codec on the Pb1550 board. We get an address and two data
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* bytes to write, create an i2c message, and send it across the
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* i2c transfer function. We do this here because we have access to
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* the i2c adapter structure.
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*/
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static struct i2c_msg wm_i2c_msg; /* We don't want this stuff on the stack */
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static u8 i2cbuf[2];
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int
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pb1550_wm_codec_write(u8 addr, u8 reg, u8 val)
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static int
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i2c_au1550_resume(struct platform_device *pdev)
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{
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wm_i2c_msg.addr = addr;
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wm_i2c_msg.flags = 0;
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wm_i2c_msg.buf = i2cbuf;
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wm_i2c_msg.len = 2;
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i2cbuf[0] = reg;
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i2cbuf[1] = val;
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struct i2c_au1550_data *priv = platform_get_drvdata(pdev);
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volatile psc_smb_t *sp = (volatile psc_smb_t *)priv->psc_base;
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return pb1550_board_adapter.algo->master_xfer(&pb1550_board_adapter, &wm_i2c_msg, 1);
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sp->psc_ctrl = PSC_CTRL_ENABLE;
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au_sync();
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while (!(sp->psc_smbstat & PSC_SMBSTAT_SR))
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au_sync();
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return 0;
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}
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static struct platform_driver au1xpsc_smbus_driver = {
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.driver = {
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.name = "au1xpsc_smbus",
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.owner = THIS_MODULE,
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},
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.probe = i2c_au1550_probe,
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.remove = __devexit_p(i2c_au1550_remove),
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.suspend = i2c_au1550_suspend,
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.resume = i2c_au1550_resume,
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};
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static int __init
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i2c_au1550_init(void)
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{
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printk(KERN_INFO "Au1550 I2C: ");
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/* This is where we would set up a 50MHz clock source
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* and routing. On the Pb1550, the SMBus is PSC2, which
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* uses a shared clock with USB. This has been already
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* configured by Yamon as a 48MHz clock, close enough
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* for our work.
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*/
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if (i2c_au1550_add_bus(&pb1550_board_adapter) < 0) {
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printk("failed to initialize.\n");
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return -ENODEV;
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}
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printk("initialized.\n");
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return 0;
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return platform_driver_register(&au1xpsc_smbus_driver);
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}
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static void __exit
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i2c_au1550_exit(void)
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{
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i2c_au1550_del_bus(&pb1550_board_adapter);
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platform_driver_unregister(&au1xpsc_smbus_driver);
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}
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MODULE_AUTHOR("Dan Malek, Embedded Edge, LLC.");
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@ -1,32 +0,0 @@
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/*
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* Copyright (C) 2004 Embedded Edge, LLC <dan@embeddededge.com>
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* 2.6 port by Matt Porter <mporter@kernel.crashing.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef I2C_AU1550_H
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#define I2C_AU1550_H
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struct i2c_au1550_data {
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u32 psc_base;
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int xfer_timeout;
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int ack_timeout;
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};
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int i2c_au1550_add_bus(struct i2c_adapter *);
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int i2c_au1550_del_bus(struct i2c_adapter *);
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#endif /* I2C_AU1550_H */
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